[info] Using makefile-style concurrent boot in runlevel 2. [ 43.245296][ T27] audit: type=1800 audit(1586250623.609:21): pid=7647 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 43.285878][ T27] audit: type=1800 audit(1586250623.619:22): pid=7647 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.242' (ECDSA) to the list of known hosts. 2020/04/07 09:10:34 fuzzer started 2020/04/07 09:10:36 dialing manager at 10.128.0.105:42903 2020/04/07 09:10:36 syscalls: 2955 2020/04/07 09:10:36 code coverage: enabled 2020/04/07 09:10:36 comparison tracing: enabled 2020/04/07 09:10:36 extra coverage: enabled 2020/04/07 09:10:36 setuid sandbox: enabled 2020/04/07 09:10:36 namespace sandbox: enabled 2020/04/07 09:10:36 Android sandbox: /sys/fs/selinux/policy does not exist 2020/04/07 09:10:36 fault injection: enabled 2020/04/07 09:10:36 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/04/07 09:10:36 net packet injection: enabled 2020/04/07 09:10:36 net device setup: enabled 2020/04/07 09:10:36 concurrency sanitizer: enabled 2020/04/07 09:10:36 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/04/07 09:10:36 USB emulation: /dev/raw-gadget does not exist syzkaller login: [ 57.122633][ T7811] KCSAN: could not find function: '__follow_mount_rcu' [ 57.817457][ T7811] KCSAN: could not find function: 'poll_schedule_timeout' [ 62.431781][ T7811] KCSAN: could not find function: '_find_next_bit' 2020/04/07 09:10:43 adding functions to KCSAN blacklist: 'ext4_free_inodes_count' 'n_tty_receive_buf_common' '__follow_mount_rcu' 'ext4_write_end' 'find_get_pages_range_tag' 'shmem_file_read_iter' 'futex_wait_queue_me' 'poll_schedule_timeout' '__filemap_fdatawrite_range' 'audit_log_start' 'ep_poll' 'wbt_done' 'do_nanosleep' 'xas_find_marked' 'ext4_mark_iloc_dirty' 'tick_sched_do_timer' 'ext4_mb_good_group' 'ktime_get_real_seconds' 'run_timer_softirq' 'pcpu_alloc' 'blk_mq_sched_dispatch_requests' 'mod_timer' 'snd_seq_prioq_cell_out' 'do_exit' 'blk_mq_dispatch_rq_list' 'generic_fillattr' 'tick_nohz_idle_stop_tick' 'atime_needs_update' 'echo_char' 'copy_process' 'kauditd_thread' '__snd_rawmidi_transmit_ack' 'xas_clear_mark' 'do_syslog' '__ext4_new_inode' 'generic_write_end' 'dd_has_work' 'add_timer' 'do_signal_stop' 'ext4_has_free_clusters' '__delete_from_page_cache' 'blk_mq_get_request' 'ext4_nonda_switch' 'ext4_writepages' 'watchdog' '_find_next_bit' 'tick_nohz_next_event' 'lruvec_lru_size' 'wbt_issue' [ 67.289012][ C1] ================================================================== [ 67.297141][ C1] BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0 [ 67.305523][ C1] [ 67.307840][ C1] write to 0xffff88812c01dbe4 of 1 bytes by task 0 on cpu 0: [ 67.315189][ C1] timer_clear_idle+0x3d/0x50 [ 67.319845][ C1] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 67.325715][ C1] tick_nohz_idle_exit+0x19c/0x1d0 [ 67.330804][ C1] do_idle+0xac/0x290 [ 67.334765][ C1] cpu_startup_entry+0x14/0x20 [ 67.339508][ C1] rest_init+0xe4/0xeb [ 67.343815][ C1] arch_call_rest_init+0x13/0x2b [ 67.348733][ C1] start_kernel+0xcc2/0xceb [ 67.353212][ C1] secondary_startup_64+0xa4/0xb0 [ 67.358204][ C1] [ 67.360511][ C1] read to 0xffff88812c01dbe4 of 1 bytes by interrupt on cpu 1: [ 67.368051][ C1] trigger_dyntick_cpu.isra.0+0x6d/0xf0 [ 67.373573][ C1] add_timer_on+0x192/0x2c0 [ 67.378055][ C1] clocksource_watchdog+0x699/0x7c0 [ 67.383416][ C1] call_timer_fn+0x58/0x2e0 [ 67.387901][ C1] run_timer_softirq+0xb14/0xbd0 [ 67.392823][ C1] __do_softirq+0x118/0x34a [ 67.397322][ C1] run_ksoftirqd+0x41/0x60 [ 67.401741][ C1] smpboot_thread_fn+0x374/0x4a0 [ 67.406671][ C1] kthread+0x1cb/0x1f0 [ 67.410739][ C1] ret_from_fork+0x1f/0x30 [ 67.415137][ C1] [ 67.417442][ C1] Reported by Kernel Concurrency Sanitizer on: [ 67.423576][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.6.0-rc1-syzkaller #0 [ 67.431760][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.441922][ C1] ================================================================== [ 67.449976][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 67.456807][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.6.0-rc1-syzkaller #0 [ 67.464938][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.474971][ C1] Call Trace: [ 67.478247][ C1] dump_stack+0x11d/0x187 [ 67.482563][ C1] panic+0x210/0x640 [ 67.486453][ C1] ? vprintk_func+0x89/0x13a [ 67.491031][ C1] kcsan_report.cold+0xc/0xf [ 67.495633][ C1] kcsan_setup_watchpoint+0x3fb/0x440 [ 67.500994][ C1] trigger_dyntick_cpu.isra.0+0x6d/0xf0 [ 67.506536][ C1] add_timer_on+0x192/0x2c0 [ 67.511024][ C1] clocksource_watchdog+0x699/0x7c0 [ 67.516220][ C1] ? clocksource_select_watchdog+0x410/0x410 [ 67.522243][ C1] ? clocksource_select_watchdog+0x410/0x410 [ 67.528250][ C1] call_timer_fn+0x58/0x2e0 [ 67.533084][ C1] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 67.538982][ C1] ? clocksource_select_watchdog+0x410/0x410 [ 67.544976][ C1] run_timer_softirq+0xb14/0xbd0 [ 67.549914][ C1] ? kvm_clock_read+0x14/0x30 [ 67.554598][ C1] ? kvm_sched_clock_read+0x5/0x10 [ 67.559700][ C1] ? sched_clock+0xf/0x20 [ 67.564008][ C1] ? sched_clock_cpu+0x10/0xd0 [ 67.568759][ C1] __do_softirq+0x118/0x34a [ 67.573246][ C1] ? takeover_tasklets+0x240/0x240 [ 67.578338][ C1] run_ksoftirqd+0x41/0x60 [ 67.582751][ C1] smpboot_thread_fn+0x374/0x4a0 [ 67.587676][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 67.593631][ C1] kthread+0x1cb/0x1f0 [ 67.597687][ C1] ? kthread_unpark+0xd0/0xd0 [ 67.602351][ C1] ret_from_fork+0x1f/0x30 [ 68.690918][ C1] Shutting down cpus with NMI [ 68.697086][ C1] Kernel Offset: disabled [ 68.701418][ C1] Rebooting in 86400 seconds..